Apple has built an ecosystem of automatic app re-compiling for new architecture. Every AppStore app that is built using modern (last 5 years) tools and xcode, in theory, should be transparently re-compilable to a different uarch. Apple currently does this with watchos apps.
So, yes, they learned. I suspect they will ship an x86 emulator as they did with Rosetta, additionally.
I honestly don't understand what direct benefit that I, a consumer, get from 5G (mmwave or normal spectrum)? My 4G device already can stream 1080p video at high quality. For every use case that I have with my phone, 5G doesn't appear to offer any material improvement.
Sure, the carriers can make more out of their bandwidth, but that's not really something I'm willing to pay for.
And, it's not like 4G is going anywhere, it'll be continued to be supported for a long time.
Actually, considering the impact on battery life that 5G has on consumer devices... I don't think I actually want it, to be honest. Don't get me wrong, I won't resist a natural upgrade when I upgrade my iphone 8 in 2-3 years, but I'm not seeking it out either.
So, yes, they learned. I suspect they will ship an x86 emulator as they did with Rosetta, additionally.